One vertex per element, one color per generator, with an edge from x to x·s.
(3,8)(6,7)(9,10,15,18)(11,17,22,16)(12,14,13,23)(19,24,20,21)(25,26,29,32)(27,30,34,37)(28,31,35,38)(33,36,39,40)(1,2,5,4)(3,7,8,6)(9,11)(10,16)(12,19)(13,20)(14,21)(15,22)(17,18)(23,24)(25,27,29,34)(26,30,32,37)(28,33,35,39)(31,36,38,40)(1,3)(2,6)(4,7)(5,8)(9,12,15,13)(10,14,18,23)(11,19,22,20)(16,21,17,24)(25,26)(27,30)(28,31)(29,32)(33,36)(34,37)(35,38)(39,40)(2,4)(6,7)(9,13,15,12)(10,14,18,23)(11,20,22,19)(16,21,17,24)(25,27)(26,30)(28,33)(29,34)(31,36)(32,37)(35,39)(38,40)(1,3)(2,7)(4,6)(5,8)(9,11)(10,17)(12,19)(13,20)(14,24)(15,22)(16,18)(21,23)(25,26)(27,30)(28,31)(29,32)(33,36)(34,37)(35,38)(39,40) involution — undirected(1,4,5,2)(3,7,8,6)(9,14)(10,13)(11,21)(12,18)(15,23)(16,20)(17,19)(22,24)(25,28,29,35)(26,31,32,38)(27,33,34,39)(30,36,37,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.